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implement Date;
include "sys.m";
sys: Sys;
include "daytime.m";
daytime : Daytime;
Tm: import daytime;
include "date.m";
# print dates in the format
# Wkd, DD Mon YYYY HH:MM:SS GMT
# parse dates of formats
# Wkd, DD Mon YYYY HH:MM:SS GMT
# Weekday, DD-Mon-YY HH:MM:SS GMT
# Wkd Mon ( D|DD) HH:MM:SS YYYY
# plus anything similar
SEC2MIN: con 60;
SEC2HOUR: con (60*SEC2MIN);
SEC2DAY: con (24*SEC2HOUR);
# days per month plus days/year
dmsize := array[] of {
365, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
};
ldmsize := array[] of {
366, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
};
# return the days/month for the given year
weekdayname := array[] of {
"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
};
wdayname := array[] of {
"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
};
monname := array[] of {
"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
init()
{
daytime = load Daytime Daytime->PATH;
sys = load Sys "$Sys";
if (daytime==nil)
sys->print("daytime load: %r\n");
}
# internals....
dateindex : fn(nil: string, nill:array of string): int;
gmtm2sec : fn(tm: Tm): int;
yrsize(yr : int): array of int
{
if(yr % 4 == 0 && (yr % 100 != 0 || yr % 400 == 0))
return ldmsize;
else
return dmsize;
}
tolower(c: int): int
{
if(c >= 'A' && c <= 'Z')
return c - 'A' + 'a';
return c;
}
isalpha(c: int): int
{
return c >= 'A' && c <= 'Z' || c >= 'a' && c <= 'z';
}
isdig(c: int): int
{
return c >= '0' && c <= '9';
}
dateconv(t: int): string
{
tm : ref Tm;
tm = daytime->gmt(t);
return sys->sprint("%s, %.2d %s %.4d %.2d:%.2d:%.2d GMT",
wdayname[tm.wday], tm.mday, monname[tm.mon], tm.year+1900,
tm.hour, tm.min, tm.sec);
}
dateword(date : string): (string,string) {
p : string;
i:=0;
p = "";
while((i<len date) && !isalpha(date[i]) && !isdig(date[i]))
i++;
while((i<len date) && isalpha(date[i])){
p[len p] = tolower(date[i]);
i++;
}
rest := "";
if(i < len date)
rest = date[i:];
return (rest,p);
}
datenum(date : string): (string, int){
n, i : int;
i=0;
while((i<len date) && !isdig(date[i]))
i++;
if(i == len date)
return (nil, -1);
n = 0;
while((i<len date) && isdig(date[i])){
n = n * 10 + date[i] - '0';
i++;
}
return (date[i:], n);
}
# parse a date and return the seconds since the epoch
# return 0 for a failure
# could be big?
date2sec(date : string): int
{
tm : Tm;
buf : string;
# Weekday|Wday
(date,buf) = dateword(date);
tm.wday = dateindex(buf, wdayname);
if(tm.wday < 0)
tm.wday = dateindex(buf, weekdayname);
if(tm.wday < 0)
return 0;
# check for the two major formats
(date,buf) = dateword(date);
tm.mon = dateindex(buf, monname);
if(tm.mon >= 0){
# MM
(date, tm.mday) = datenum(date);
if(tm.mday < 1 || tm.mday > 31)
return 0;
# HH:MM:SS
(date, tm.hour) = datenum(date);
if(tm.hour < 0 || tm.hour >= 24)
return 0;
(date, tm.min) = datenum(date);
if(tm.min < 0 || tm.min >= 60)
return 0;
(date, tm.sec) = datenum(date);
if(tm.sec < 0 || tm.sec >= 60)
return 0;
# YYYY
(nil, tm.year) = datenum(date);
if(tm.year < 70 || tm.year > 99 && tm.year < 1970)
return 0;
if(tm.year >= 1970)
tm.year -= 1900;
}else{
# MM-Mon-(YY|YYYY)
(date, tm.mday) = datenum(date);
if(tm.mday < 1 || tm.mday > 31)
return 0;
(date,buf) = dateword(date);
tm.mon = dateindex(buf, monname);
if(tm.mon < 0 || tm.mon >= 12)
return 0;
(date, tm.year) = datenum(date);
if(tm.year < 70 || tm.year > 99 && tm.year < 1970)
return 0;
if(tm.year >= 1970)
tm.year -= 1900;
# HH:MM:SS
(date, tm.hour) = datenum(date);
if(tm.hour < 0 || tm.hour >= 24)
return 0;
(date, tm.min) = datenum(date);
if(tm.min < 0 || tm.min >= 60)
return 0;
(date, tm.sec) = datenum(date);
if(tm.sec < 0 || tm.sec >= 60)
return 0;
# timezone
(date,buf)=dateword(date);
if(len buf >= 3 && lowercase(buf[0:3])!="gmt")
return 0;
}
tm.zone="GMT";
return gmtm2sec(tm);
}
lowercase(name:string): string
{
p: string;
for(i:=0;i<len name;i++)
p[i]=tolower(name[i]);
return p;
}
dateindex(d : string, tab : array of string): int
{
for(i := 0; i < len tab; i++)
if (lowercase(tab[i]) == d)
return i;
return -1;
}
# compute seconds since Jan 1 1970 GMT
gmtm2sec(tm:Tm): int
{
secs,i : int;
d2m: array of int;
sys = load Sys "$Sys";
secs=0;
#seconds per year
tm.year += 1900;
if(tm.year < 1970)
return 0;
for(i = 1970; i < tm.year; i++){
d2m = yrsize(i);
secs += d2m[0] * SEC2DAY;
}
#seconds per month
d2m = yrsize(tm.year);
for(i = 0; i < tm.mon; i++)
secs += d2m[i+1] * SEC2DAY;
#secs in last month
secs += (tm.mday-1) * SEC2DAY;
#hours, minutes, seconds
secs += tm.hour * SEC2HOUR;
secs += tm.min * SEC2MIN;
secs += tm.sec;
return secs;
}
now(): int
{
return daytime->now();
}
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